0.4

Changes since 0.3:

• Add global option chroot to change root directory after startup
• Add global option user to drop root privileges to specified user
• Add phyint option blacklist for fine-grained forwarding control (can be compiled with existing option whitelist)
• Do not unconditionally filter local multicast address 239.255.255.250 (Fixes #54)
  • NOTE: Use new option blacklist for filtering address when required